本文主要介紹new XMLHttpRequest()監(jiān)聽附件上傳進(jìn)度,解決優(yōu)化loading長時間加載,用戶等待問題
經(jīng)測試發(fā)現(xiàn),new XMLHttpRequest()在附件上傳請求中,WIFI關(guān)閉切4G上傳,上傳進(jìn)度不會持續(xù);4G不關(guān)閉打開WIFI會繼續(xù)上傳,但等待時間過長,實(shí)際上是4G在上傳,倘若關(guān)閉4G網(wǎng)絡(luò),上傳進(jìn)度終止。
<div class="process-wrapper" id="processWrap"> <div class="process-face"></div> <img class="close-icon" id="closeBtn" src="../../images/close.png" alt=""> <div class="process"> <div class="process-inner" id="processInner" style="width:50%"></div> <div class="process-value"> <span>提交中...</span> <span id="process">0%</span> </div> </div> </div>
/* 附件上傳進(jìn)度條 */ .process-wrapper{ -moz-user-select:none; position: fixed; left: 0; top: 0; bottom: 0; right: 0; z-index: 10000; display: none; } .process-face{ width: 100%; height: 100%; background-color: #000; opacity: 0.7; position: fixed; } .close-icon{ width: 26px; height: 26px; position: fixed; left: 50%; top: calc( 50% + 40px ); transform: translate(-50%,-50%); } .process{ width: 90%; height: 30px; background-color: #fff; border-radius: 30px; overflow: hidden; position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); text-align: center; font-size: 14px; line-height: 30px; color: #999; } .process-inner{ width: 100%; height: 30px; position: absolute; left: 0; top: 0; background-color: #0079C1; transition: 0.1s; z-index: -1; }
(function(app, doc) { var $processWrap = document.getElementById("processWrap"), $closeBtn = document.getElementById("closeBtn"), xhr = new XMLHttpRequest(); doc.addEventListener('netchange', onNetChange, false); function onNetChange() { if ($processWrap.style.display != "none") { $processWrap.style.display = "none"; xhr.abort(); mui.toast('網(wǎng)絡(luò)中斷請重試'); } } doSend: function() { app.ajaxFile({ //封裝好的ajax請求 url: "", data: FormData, xhr: xhr, success: function(r) { if (r == '1') { mui.toast("保存成功"); // 上傳成功邏輯處理 } else { $processWrap.style.display = "none"; mui.toast(app.netError); } }, error: function(r) { $processWrap.style.display = "none"; }, progress: function(e) { if (e.lengthComputable) { var progressBar = parseInt((e.loaded / e.total) * 100); if (progressBar < 100) { $progress.innerHTML = progressBar + "%"; $processInner.style.width = progressBar + "%"; } } }, timeout:function(){ $processWrap.style.display = "none"; } }); }) mui.plusReady(function() { $closeBtn.addEventListener("tap",function(){ setTimeout(function(){ $processWrap.style.display = "none"; xhr.abort(); }, 400); }) }); })(app, document);
var $ajaxCount = 0; window.app = { //ajaxFile超時時間 fileTimeout: 180000, ajaxFile: function(option) { $ajaxCount++; var _ajaxCount = $ajaxCount; if (!option.error) { option.error = ajaxError; // 請求失敗提示 } if (option.validateUserInfo == undefined) option.validateUserInfo = true; var xhr = option.xhr || new XMLHttpRequest(); xhr.timeout = app.fileTimeout; xhr.open('POST', app.getItem(app.localKey.url) + option.url, true); xhr.onreadystatechange = function() { if (xhr.readyState == 4 && xhr.status == 200) { var r = xhr.responseText; if (r) { r = JSON.parse(r); } if (_ajaxCount == $ajaxCount) { option.success && option.success(r); } } } xhr.upload.onprogress = function (e) { option.progress(e); } xhr.onerror = function(e) { option.error(e); // 添加 上傳失敗后的回調(diào)函數(shù) } xhr.ontimeout = function(e){ option.timeout(e); app.closeWaiting(); $.toast("請求超時,請重試"); xhr.abort(); } xhr.send(option.data); }, }
拓展:后端NodeJS實(shí)現(xiàn)代碼
const express = require("express"); const multer = require("multer"); const expressStatic = require("express-static"); const fs = require("fs"); let server = express(); let upload = multer({ dest: __dirname+'/uploads/' }) // 處理提交文件的post請求 server.post('/upload_file', upload.single('file'), function (req, res, next) { console.log("file信息", req.file); fs.rename(req.file.path, req.file.path+"."+req.file.mimetype.split("/").pop(), ()=>{ res.send({status: 1000}) }) }) // 處理靜態(tài)目錄 server.use(expressStatic(__dirname+"/www")) // 監(jiān)聽服務(wù) server.listen(8080, function(){ console.log("請使用瀏覽器訪問 http://localhost:8080/") });
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標(biāo)簽:阜陽 崇左 眉山 青海 晉中 河池 北海 營口
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